DR. FREDERICK P GROIS III M.D.
NPI 1528137841
Anesthesiology in Manassas, VA
About Dr. Frederick P Grois Iii M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. FREDERICK P GROIS III M.D. (NPI 1528137841) is an individual anesthesiology provider in Manassas, Virginia, licensed in Virginia (0101240534) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of Uniformed Services Uhs Fe Hebert School Of Med (2005).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Frederick P Grois Iii M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Frederick Grois reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fairfox, VA 22030
- Reassigned Medicare billing, District of Columbia enrollment
- 26 clinicians in this Medicare group
Woodbridge, VA 22191
- Reassigned Medicare billing, Virginia enrollment
- 170 clinicians in this Medicare group
Falls Church, VA 22042
- Reassigned Medicare billing, Virginia enrollment
- 1,217 clinicians in this Medicare group
Washington, DC 20016
- Reassigned Medicare billing, Virginia enrollment
- 119 clinicians in this Medicare group
Suffolk, VA 23434
- Reassigned Medicare billing, Virginia enrollment
- 36 clinicians in this Medicare group
Greenville, NC 27834
- Reassigned Medicare billing, Virginia enrollment
- 77 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Frederick Grois's NPI number?
The NPI number for Frederick Grois is 1528137841. It was assigned to this individual provider in the NPPES registry on November 8, 2006.
Where is Frederick Grois located?
Frederick Grois practices at 8700 Sudley Rd, Manassas, VA 20110. The listed phone number is (703) 369-8000.
What is Frederick Grois's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Frederick Grois enrolled in Medicare?
Yes. Frederick Grois is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Frederick Grois's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Frederick Grois reassigns Medicare benefits to 6 organizations: Ambulatory Anesthesia Services Inc (Fairfox, VA), Premier Anesthesia Of Virginia LLC (Woodbridge, VA), American Anesthesiology Of Virginia PC (Falls Church, VA), Surgical Anesthesia Associates, PLLC (Washington, DC), Tidewater Anesthesia Consultants PLLC (Suffolk, VA) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Frederick Grois's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Frederick Grois accept?
Health plans from Oscar Health and Oscar Insurance Company list Frederick Grois as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Frederick Grois was last updated on April 7, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Frederick P Grois III, M.D. · NPI 1528137841
Anesthesiology physician in Manassas, Virginia. Individual provider, active in the CMS NPPES registry since November 8, 2006.
## Identity
- **NPI:** 1528137841 (Entity type: Individual)
- **Enumerated:** November 8, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 0101240534 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 8700 SUDLEY RD, Manassas, VA 20110-4418
- **Phone:** (703) 369-8000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Ambulatory Anesthesia Services Inc (NPI 1548363740, Fairfox, VA); Premier Anesthesia Of Virginia LLC (NPI 1255986147, Woodbridge, VA); American Anesthesiology Of Virginia PC (NPI 1417994872, Falls Church, VA); Surgical Anesthesia Associates, PLLC (NPI 1811930647, Washington, DC); Tidewater Anesthesia Consultants PLLC (NPI 1013869247, Suffolk, VA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Uniformed Services Uhs Fe Hebert School Of Med, class of 2005
## Record status
- **NPPES last updated:** April 7, 2017
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Source: [NPI Profile](https://npiprofile.com/npi/1528137841) · Data from the CMS NPPES public registry.